Last week, the Department of Homeland Security revealed a rash of
cyber attacks on natural gas pipeline companies. Just as with previous
cyber attacks on infrastructure, there was no known physical damage. But
security experts worry it may only be a matter of time.

Efforts to protect pipelines and other critical systems have been
halting despite broad agreement that they’re vulnerable to viruses like Stuxnet — the mysterious worm that caused havoc to Iran’s nuclear program two years ago.